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Defined 2-way link-list xtext grammar issues [message #1848907]

Wed, 22 December 2021 22:13

Eclipse User

I am working on creating xtext grammar but am facing 1 problem
I have a defined grammar below
I want to create an AST which 's lthe same as a 2-way link-list (Each Step will have 2 feature to refer to next step and previous step), namely:

Step1 ----(nextStep)---> Step2 ---(nextStep)---->Step3
and Step1 <---(preStep)----- Step2 <--(preStep)------ Step3

BUT i dont know how to define grammar to achive that goal

Can someone help me, plz !!!

Usecase:
 firstStep = Step
;

Step:
 name = ID
 ({Step.preStep = current} nextStep = Step)?
;

Re: Defined 2-way link-list xtext grammar issues [message #1848913 is a reply to message #1848907]

Thu, 23 December 2021 04:31

Eclipse User

xtext is not good with bidi refs, but you know that you can always use eContainer() to navigate to parent element. i assume it would help here

Re: Defined 2-way link-list xtext grammar issues [message #1848919 is a reply to message #1848913]

Thu, 23 December 2021 10:25

Eclipse User

Oh my bad ... I forgot this :v ... thank you very much !!!

Re: Defined 2-way link-list xtext grammar issues [message #1848924 is a reply to message #1848919]

Thu, 23 December 2021 14:15

Eclipse User

Hi

In regards to the bidirectional reference, it is easiest to just treat it as unidirectional in the most convenient direction. The magic of EMF will automatically maintain the opposite direction for free.

Regards

Ed Willink

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